filesDir中定义所有所需的目录。fileabc.pdf的新名称为：compr_fileabc.pdf。
编辑＃1：
根据评论的要求，我更改了脚本以编写新的pdf文件或覆盖输入pdf文件。要在这两个选项之间选择，请将createNewPDFs变量更改为1(新文件)或0(覆盖)。%TEMP%)并移动到原始输入文件以覆盖此文件。只有在新文件大小较小时，它才会覆盖输入pdf文件。ghostscript命令被替换为具有相同名称的变量，因为在Windows下它可以是gswin64c(64位)或gswin32c(32位)。-dPDFSETTINGS=/printer，下面将对其进行解释。
批处理脚本：
@echo off
setlocal EnableDelayedExpansion
rem ghostscript executable name
set "ghostscript=gswin64c"
rem directories to scan for files
set "filesDir[0]=FOLDER1"
set "filesDir[1]=FOLDER2"
set "filesDir[2]=FOLDER3"
rem extension of files to be scanned
set "ext=pdf"
rem new file be creation or input file overwrite
set "createNewPDFs=0"
rem file prefix for new files (if they should be created)
set "filepre=compr_"
rem loop over all directories defined in filesDir array
for /f "tokens=2 delims==" %%d in ('set filesDir[') do (
if exist "%%~d" (
pushd "%%~d"
rem loop over all files in all (sub)directories with given extension
for /f "delims=*" %%f in ('dir "*.%ext%" /b /s /a:-d') do (
if [%createNewPDFs%] EQU [1] (
%ghostscript% -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/printer -dNOPAUSE -dQUIET -dBATCH -sOutputFile="%%~dpf%filepre%%%~nxf" "%%~f"
) else (
%ghostscript% -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/printer -dNOPAUSE -dQUIET -dBATCH -sOutputFile="%TEMP%\%%~nxf" "%%~f"
for %%t in ("%TEMP%\%%~nxf") do ( set "newSize=%%~zt" )
for %%t in ("%%~f") do ( set "oldSize=%%~zt" )
if [!newSize!] LSS [!oldSize!] (
rem new file is smaller --> overwrite
move /y "%TEMP%\%%~nxf" "%%~f"
) else (
rem new file is greater --> delete it of the temp dir
del "%TEMP%\%%~nxf"
)
)
)
popd
)
)
发现了GitHub上的Ghostscript命令，可以降低pdf文件的大小：
This can reduce files to ~15% of their size (2.3M to 345K, in one case) with no obvious degradation of quality.
ghostscript -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/printer -dNOPAUSE -dQUIET -dBATCH -sOutputFile=output.pdf input.pdfOther options for PDFSETTINGS:
- /screen selects low-resolution output similar to the Acrobat Distiller "Screen Optimized" setting.
- /ebook selects medium-resolution output similar to the Acrobat Distiller "eBook" setting.
- /printer selects output similar to the Acrobat Distiller "Print Optimized" setting.
- /prepress selects output similar to Acrobat Distiller "Prepress Optimized" setting.
- /default selects output intended to be useful across a wide variety of uses, possibly at the expense of a larger output file.
来自ss64.com的命令参考链接:
我不知道是否有人需要，但这是我的命令，可以高度压缩 PDF 文件而不会降低质量。通过多次尝试和错误的方法，我找到了它，可以大大减小PDF文件的大小。 P.S. 抱歉没有在上面的线程中发布，但作为新手，我没有足够的声望。
%ghostscript% -q -dNOPAUSE -dBATCH -dSAFER -dSimulateOverprint=true -sDEVICE=pdfwrite -dPDFSETTINGS=/ebook -dEmbedAllFonts=true -dSubsetFonts=true -dAutoRotatePages=/None -dColorImageDownsampleType=/Bicubic -dColorImageResolution=150 -dGrayImageDownsampleType=/Bicubic -dGrayImageResolution=150 -dMonoImageDownsampleType=/Bicubic -dMonoImageResolution=150 -sOutputFile=output.pdf input.pdf
我遇到了同样的问题，这个帮助了我。将15 MB的PDF转换成了400kb。
gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.2 -r200 -dPrinted=false -dNOPAUSE -dQUIET -dBATCH -sOutputFile=c12_{filename} {filename}
$ brew install ghostscript
output/的新空目录。script.sh的bash脚本。sh script.sh运行脚本。#!/bin/bash
# Get a list of all .pdf files in the current directory
files=$(ls *.pdf)
# Loop over the list of files
for file in $files
do
echo "Processing file: $file"
# Run the GS script for each file
gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.2 -r200 -dPrinted=false -dNOPAUSE -dQUIET -dBATCH -sOutputFile=./output/"$file" "$file" &
# Wait for the previous command to finish before starting the next one
wait $!
echo "Finished processing file: $file"
done
echo "All .pdf files have been processed"
这里的所有内容都无法与最新的gs一起使用，所以我最终选择了
gswin64c.exe -dPDFSETTINGS#/ebook -dPDFX -dBATCH -dNOPAUSE -sColorConversionStrategy=CMYK -sDEVICE=pdfwrite -sOutputFile="output.pdf" "input.pdf"
并且使用自适应大小形式的jpg和顺时针旋转90度
gswin64c -dORIENT1=false -dBATCH -dNOPAUSE -sDEVICE=pdfwrite -sOutputFile=C:\Users\username\Desktop\somepdffile.pdf -c "<</Orientation 3>> setpagedevice" -f "C:\Program Files\gs\gs9.19\lib\viewjpeg.ps" -c "(C:\\Users\\username\\Desktop\\somejpgfile.JPG) << /PageSize 2 index viewJPEGgetsize 2 array astore >> setpagedevice viewJPEG"
/方向3控制旋转角度
我注意到在许多类似这样的主题下，用户都在寻找一种简单的方法来缩小PDF文件以便通过网络传输。例如，Windows 10内置的PDF编写器没有压缩PDF文件的手段。
这就是为什么我想在这里分享我的最终版本的自动Ghostscript PDF转换批处理文件，适用于Windows 64位。当用户将大型PDF文件拖放到Windows文件夹中的此批处理文件上方时，此批处理文件会自动将其转换为较小的版本。请注意！-此批处理文件和大型PDF文件必须位于同一文件夹中，并且在使用之前必须在Windows上安装正确版本（32/64位）的Ghostscript。还要注意，当对同一文件使用一次后，此批处理将使用以“_original.pdf”结尾的名称保存原始大型PDF。如果用户不断转换相同的文件，则原始文件将被较小的版本替换。
@echo off
rem
rem === This part separates the filename and folder names to two different variables and replaces empty spaces in filename with underlines ===
set filename=%1
set filename=%filename: =_%
for %%A in ("%filename%") do (
set Folder=%%~dpA
set Name=%%~nA )
echo.Folder is: %Folder%
echo.Name is: %Name%
rem
rem === Copy the original file to - Name_original.pdf - removing the space from the end of - Name - variable ===
copy %1 "%Name: =_%original.pdf"
rem
rem === Copy the original file to a temporary file for Ghostscript to use ===
copy %1 oldTempFile.pdf
rem
rem === Run Ghostscript to create much smaller size PDF from your original and replace the drag and dropped - Name.pdf - file with it ==
gswin64.exe -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/screen -dNOPAUSE -dBATCH -dQUIET -dDownsampleColorImages=true -dColorImageResolution=200 -dColorImageDownsampleType=/Bicubic -sOutputFile=%1 oldTempFile.pdf
rem
rem == Remove the temporary file after use ===
del oldTempFile.pdf